mullet's 93 bighorn 3.1ITD manual LWB

[gomulletgo]

Hi Geeves,

Thanks for that info I've just checked the truck again tonight. I don't think the multimeter is at fault. I checked several other things and the meter worked flawlessly.

A bit of background, when I got the vehicle the lady told me the battery was dicky, I knew the alternator belt was loose so I've tightened that. I noted that the battery window was showing green which is good. I put the battery on charge overnight and got the battery charged up.

Now about a week or two later the battery is back down to 12.35V I'd expect over 12.6V if the battery was good and not being drained by the truck.

So I did some more checking of the cigarette lighter and there is definitely 0.6V there even with the key in the "LOCK" position. I confirmed this by testing voltage and resistance, I used the cigarette lighter's earth and also a completely separate earth to confirm my findings. Removing the cig lighter fuse dropped the cig lighter voltage to zero.

I removed the positive terminal clamp from the battery so I could touch it on the battery positive terminal lightly looking for sparking, sure enough it sparks a little every time they touch. Also there is a loud clicking (solenoid?) coming from somewhere around the passengers firewall area, is this normal? What is it? Perhaps there is some voltage draining there as well as the cig lighter.

In case it's relevant, I've currently got the stereo removed and a bunch of other dash things un-plugged, I don't think this should create the above issues though.

I'm hoping some bright sparks can shed some light on this Maybe I should move this issue from the build thread to the electrical faults thread area?

[geeves]

Some leakage for sure. Can be a hard slog to find it. Eliminate one thing at a time and keep notes

[gomulletgo]

UPDATE: So I've just wired up my EGT and boost gauge that I previously had in my UBS55. I just took the UBS69 for a test drive and the boost is about 10psi which is about where I'd expect it to be. But the EGT's were really high on acceleration, on a cold engine I hit over 600°C in third gear going slightly downhill !

I did a few more runs and any hard acceleration in 3rd, 4th or fifth gear could get the temp over 600°C. These tests were done with the vehicle empty, no towing and on basically flat ground. I never revved up to red line.

I didn't see any black smoke at all so I don't think overfuelling is the issue (NB: I haven't touched the fuel pump. I'd say neither has previous owner)

Are these temps over 600°C normal for the 4JG2 in a Bighorn with EGR removed? I know my UBS55 with 4JB1-T in the same conditions would not be able to get up to 550°C even giving it absolute death. I don't think I ever saw 600°C in the UBS55, even towing uphill.

Could the little Vac lines not hooked up correctly create overheating? Could the exhaust flapper valve be blocking the exhaust? Could the airfilter be blocked so bad the engine is not getting enough air?

TIA

[isuzurob]

All depends on the health of the engine but my 4jb1-t ubs55 ran 750-800 degree c going up hills under load, ran like that for the 8 years i owned it, i would run the 4gj2 slightly lower as they arnt direct injection and pistons and head are weaker